1/4-20X2 GR2 HEX CAP SCR HDG SAE J429 GRADE 2 HEX CAP SCREWS HDG ASME B18.2.1 1996 IFI-7 AF 0.428-0.438” HH 0.150-0.163” AC 0.488-0.505” AC 0.488-0.505”